National Hardware U Bolt With Plate & Hex Nuts, #533 Zinc, Square, 5/16 X 2 X 3 In.

The National Hardware N222-356 is a square U-bolt fastener designed for securing hardware, brackets, and fixtures to rectangular wood and metal objects. This 5/16-inch diameter bolt features an integrated mounting plate and pre-installed hex nuts, creating a complete fastening assembly that eliminates the need for separate components. The zinc-plated steel construction resists rust and corrosion, making it suitable for both interior and exterior applications where durability and weather resistance matter.

Whether you're mounting pipe clamps, lighting fixtures, or securing structural brackets, this U-bolt combines ease of installation with reliable holding power. The square shank design provides superior pull-out resistance compared to round U-bolts, while the reinforcing plate distributes load evenly to prevent crushing or deformation of the substrate. The pre-assembled hex nuts streamline installation, saving time on job sites and DIY projects alike.

Features and Benefits

• Square Shank Design: Delivers superior pull-out resistance for heavy-duty wood and metal mounting applications.
• Zinc-Plated Steel: Corrosion-resistant finish protects against rust in outdoor, humid, and industrial environments, extending project lifespan.
• Integrated Mounting Plate: Increases bearing surface to prevent material crushing and deformation when securing brackets and fixtures.
• Pre-Installed Hex Nuts: Complete assembly eliminates the need for additional fasteners, accelerating installation and reducing assembly time.
• Versatile Sizing: 5/16-inch diameter with 2-inch width and 3-inch length dimensions fit standard brackets and support applications across DIY and professional projects.

Specifications

• Brand: National Hardware
• Model: N222-356
• Material: Steel
• Finish: Zinc-plated
• Diameter: 5/16 inch
• Width: 2 inches
• Length: 3 inches
• Thread: 5/16-18
• Thread Length: 1-1/2 inches
• Includes: Mounting plate and hex nuts assembled
• Applications: Interior and exterior use